Answer: First, hydrogen is not as energy-dense as other fuels, meaning that you need a whole lot of it to do a little bit of work. ... Fuel cells are far more efficient than internal combustion engines, and a hydrogen fuel cell has cleaner emissions than an internal-combustion hydrogen engine.
Explanation:
Answer:
Molecules in the hot water bottle are moving faster than the molecules of the skin.
Explanation:
When an object is heated, the molecules of that object move much faster than the room temperature object or a cold object. When the molecules move faster, the friction causes heat.
Answer:
To determine how many total electrons there are, add the amount of charge to the atomic number. In this case, there are fewer protons than electrons. For example, N 3- has a -3 charge which means it has 3 more electrons than a neutral nitrogen atom. Nitrogen’s atomic number is 7, therefore this ion has 10 electrons.
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HAVE A NICE DAY
Explanation:
Synthesis reaction is a reaction in which several reactants combine to form one product. Eg; hydrogen and oxygen combining to make water.
In this reaction , hydrogen and oxygen are the several reactants that combine together to form only one product (water)
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Answer:
See explanation
Explanation:
a) u= 60 m/s, v= 45 m/s, t = 7 secs
From;
v = u + at
a = v - u/t
a= 45 - 60/7
a = -2.14 m/s^2
b)
u = 200 m/s
v= 235 m/s
t = 30 secs
v = u + at
a = v-u/t
a = 235 - 200/30
a= 1.17 m/s^2
c)
i) Acceleration = 3 - 1/2-0 = 2/2 = 1 m/s^2
ii) The slope between 2 and 5 is zero because velocity was not changing with time.
iii) Within the time between 2 and 5 the speed remained at 3 m/s
iv) the slope between 5 and 8 is 2 - 3/8 - 5 = -1/3 = -0.33m/s^2
v) The negative slope means that velocity is decreasing with time(deceleration).
